deps(dotnet): Bump the testing group with 2 updates

Bumps coverlet.collector from 6.0.4 to 8.0.1
Bumps FluentAssertions from 8.8.0 to 8.9.0

---
updated-dependencies:
- dependency-name: coverlet.collector
  dependency-version: 8.0.1
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: testing
- dependency-name: FluentAssertions
  dependency-version: 8.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: testing
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Directory.Packages.props

@@ -62,8 +62,8 @@
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
     <PackageVersion Include="xunit" Version="2.9.3" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
-    <PackageVersion Include="coverlet.collector" Version="6.0.4" />
-    <PackageVersion Include="FluentAssertions" Version="8.8.0" />
+    <PackageVersion Include="coverlet.collector" Version="8.0.1" />
+    <PackageVersion Include="FluentAssertions" Version="8.9.0" />
     <PackageVersion Include="Moq" Version="4.20.72" />
   </ItemGroup>
 </Project>